Gas pumps in California could soon feature signs telling drivers they’re paying more per gallon because of the state’s cap-and-trade program for carbon emissions.

The California Independent Oil Marketers Association (CIOMA), a trade group for oil distributors, is handing out to members a label that adds wording on cap-and-trade costs to the standard one that advises motorists on gas taxes. The state requires that a label with gas taxes appear on all gas pumps. Those change on July 1 to reflect updated amounts.